[Rui_27]

Hi everyone!

I have air (21% of O2 and 79% of N2) entering into a channel with a square section. I would like to add a reaction in the bottom wall in which O2 is consumed and H2O is produced. The mass flux of each specie (O2 and H2O) will obtained through a set of equations that depend on the mass fraction of O2 in the cells next to the bottom wall.

I found that there are two main ways I can considered this reaction through UDFs:
- Set a mass source/sink using the macro DEFINE_SOURCE;
- Set the mass fraction of O2 and H2O at the wall through boundary conditions using the macro DEFINE_PROFILE.

Adding a source/sink seems easier and more intuitive but I have some doubts on how to set the source term only for that specific wall and specifying the source in the form of derivatives as described in UDF Fluent manual.

Have some of you write a similar UDF in which you can share the code (or parts of it)?

All comments are greatly appreciated and will certainty help me a lot.

Thanks in advanced.